diff options
| -rw-r--r-- | Documentation/x86_64/boot-options.txt | 8 | ||||
| -rw-r--r-- | arch/x86_64/mm/numa.c | 261 | ||||
| -rw-r--r-- | include/asm-x86_64/mmzone.h | 2 |
3 files changed, 161 insertions, 110 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt index 85f51e5a749..7500aad95f3 100644 --- a/Documentation/x86_64/boot-options.txt +++ b/Documentation/x86_64/boot-options.txt @@ -149,7 +149,13 @@ NUMA numa=noacpi Don't parse the SRAT table for NUMA setup - numa=fake=X Fake X nodes and ignore NUMA setup of the actual machine. + numa=fake=CMDLINE + If a number, fakes CMDLINE nodes and ignores NUMA setup of the + actual machine. Otherwise, system memory is configured + depending on the sizes and coefficients listed. For example: + numa=fake=2*512,1024,4*256 + gives two 512M nodes, a 1024M node, and four 256M nodes. The + remaining system RAM is allocated to an additional node. numa=hotadd=percent Only allow hotadd memory to preallocate page structures upto diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index 41b8fb06992..c55936bc6be 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -273,125 +273,172 @@ void __init numa_init_array(void) #ifdef CONFIG_NUMA_EMU /* Numa emulation */ -int numa_fake __initdata = 0; +#define E820_ADDR_HOLE_SIZE(start, end) \ + (e820_hole_size((start) >> PAGE_SHIFT, (end) >> PAGE_SHIFT) << \ + PAGE_SHIFT) +char *cmdline __initdata; /* - * This function is used to find out if the start and end correspond to - * different zones. + * Setups up nid to range from addr to addr + size. If the end boundary is + * greater than max_addr, then max_addr is used instead. The return value is 0 + * if there is additional memory left for allocation past addr and -1 otherwise. + * addr is adjusted to be at the end of the node. */ -int zone_cross_over(unsigned long start, unsigned long end) +static int __init setup_node_range(int nid, struct bootnode *nodes, u64 *addr, + u64 size, u64 max_addr) { - if ((start < (MAX_DMA32_PFN << PAGE_SHIFT)) && - (end >= (MAX_DMA32_PFN << PAGE_SHIFT))) - return 1; - return 0; + int ret = 0; + nodes[nid].start = *addr; + *addr += size; + if (*addr >= max_addr) { + *addr = max_addr; + ret = -1; + } + nodes[nid].end = *addr; + node_set_online(nid); + printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid, + nodes[nid].start, nodes[nid].end, + (nodes[nid].end - nodes[nid].start) >> 20); + return ret; } -static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn) +/* + * Splits num_nodes nodes up equally starting at node_start. The return value + * is the number of nodes split up and addr is adjusted to be at the end of the + * last node allocated. + */ +static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr, + u64 max_addr, int node_start, + int num_nodes) { - int i, big; - struct bootnode nodes[MAX_NUMNODES]; - unsigned long sz, old_sz; - unsigned long hole_size; - unsigned long start, end; - unsigned long max_addr = (end_pfn << PAGE_SHIFT); - - start = (start_pfn << PAGE_SHIFT); - hole_size = e820_hole_size(start, max_addr); - sz = (max_addr - start - hole_size) / numa_fake; - - /* Kludge needed for the hash function */ - - old_sz = sz; - /* - * Round down to the nearest FAKE_NODE_MIN_SIZE. - */ - sz &= FAKE_NODE_MIN_HASH_MASK; + unsigned int big; + u64 size; + int i; + if (num_nodes <= 0) + return -1; + if (num_nodes > MAX_NUMNODES) + num_nodes = MAX_NUMNODES; + size = (max_addr - *addr - E820_ADDR_HOLE_SIZE(*addr, max_addr)) / + num_nodes; /* - * We ensure that each node is at least 64MB big. Smaller than this - * size can cause VM hiccups. + * Calculate the number of big nodes that can be allocated as a result + * of consolidating the leftovers. */ - if (sz == 0) { - printk(KERN_INFO "Not enough memory for %d nodes. Reducing " - "the number of nodes\n", numa_fake); - numa_fake = (max_addr - start - hole_size) / FAKE_NODE_MIN_SIZE; - printk(KERN_INFO "Number of fake nodes will be = %d\n", - numa_fake); - sz = FAKE_NODE_MIN_SIZE; + big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * num_nodes) / + FAKE_NODE_MIN_SIZE; + + /* Round down to nearest FAKE_NODE_MIN_SIZE. */ + size &= FAKE_NODE_MIN_HASH_MASK; + if (!size) { + printk(KERN_ERR "Not enough memory for each node. " + "NUMA emulation disabled.\n"); + return -1; } - /* - * Find out how many nodes can get an extra NODE_MIN_SIZE granule. - * This logic ensures the extra memory gets distributed among as many - * nodes as possible (as compared to one single node getting all that - * extra memory. - */ - big = ((old_sz - sz) * numa_fake) / FAKE_NODE_MIN_SIZE; - printk(KERN_INFO "Fake node Size: %luMB hole_size: %luMB big nodes: " - "%d\n", - (sz >> 20), (hole_size >> 20), big); - memset(&nodes,0,sizeof(nodes)); - end = start; - for (i = 0; i < numa_fake; i++) { - /* - * In case we are not able to allocate enough memory for all - * the nodes, we reduce the number of fake nodes. - */ - if (end >= max_addr) { - numa_fake = i - 1; - break; - } - start = nodes[i].start = end; - /* - * Final node can have all the remaining memory. - */ - if (i == numa_fake-1) - sz = max_addr - start; - end = nodes[i].start + sz; - /* - * Fir "big" number of nodes get extra granule. - */ + + for (i = node_start; i < num_nodes + node_start; i++) { + u64 end = *addr + size; if (i < big) end += FAKE_NODE_MIN_SIZE; /* - * Iterate over the range to ensure that this node gets at - * least sz amount of RAM (excluding holes) + * The final node can have the remaining system RAM. Other + * nodes receive roughly the same amount of available pages. */ - while ((end - start - e820_hole_size(start, end)) < sz) { - end += FAKE_NODE_MIN_SIZE; - if (end >= max_addr) - break; + if (i == num_nodes + node_start - 1) + end = max_addr; + else + while (end - *addr - E820_ADDR_HOLE_SIZE(*addr, end) < + size) { + end += FAKE_NODE_MIN_SIZE; + if (end > max_addr) { + end = max_addr; + break; + } + } + if (setup_node_range(i, nodes, addr, end - *addr, max_addr) < 0) + break; + } + return i - node_start + 1; +} + +/* + * Sets up the system RAM area from start_pfn to end_pfn according to the + * numa=fake command-line option. + */ +static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn) +{ + struct bootnode nodes[MAX_NUMNODES]; + u64 addr = start_pfn << PAGE_SHIFT; + u64 max_addr = end_pfn << PAGE_SHIFT; + unsigned int coeff; + unsigned int num = 0; + int num_nodes = 0; + u64 size; + int i; + + memset(&nodes, 0, sizeof(nodes)); + /* + * If the numa=fake command-line is just a single number N, split the + * system RAM into N fake nodes. + */ + if (!strchr(cmdline, '*') && !strchr(cmdline, ',')) { + num_nodes = split_nodes_equally(nodes, &addr, max_addr, 0, + simple_strtol(cmdline, NULL, 0)); + if (num_nodes < 0) + return num_nodes; + goto out; + } + + /* Parse the command line. */ + for (coeff = 1; ; cmdline++) { + if (*cmdline && isdigit(*cmdline)) { + num = num * 10 + *cmdline - '0'; + continue; } - /* - * Look at the next node to make sure there is some real memory - * to map. Bad things happen when the only memory present - * in a zone on a fake node is IO hole. - */ - while (e820_hole_size(end, end + FAKE_NODE_MIN_SIZE) > 0) { - if (zone_cross_over(start, end + sz)) { - end = (MAX_DMA32_PFN << PAGE_SHIFT); - break; + if (*cmdline == '*') + coeff = num; + if (!*cmdline || *cmdline == ',') { + /* + * Round down to the nearest FAKE_NODE_MIN_SIZE. + * Command-line coefficients are in megabytes. + */ + size = ((u64)num << 20) & FAKE_NODE_MIN_HASH_MASK; + if (size) { + for (i = 0; i < coeff; i++, num_nodes++) + if (setup_node_range(num_nodes, nodes, + &addr, size, max_addr) < 0) + goto done; + coeff = 1; } - if (end >= max_addr) - break; - end += FAKE_NODE_MIN_SIZE; } - if (end > max_addr) - end = max_addr; - nodes[i].end = end; - printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", - i, - nodes[i].start, nodes[i].end, - (nodes[i].end - nodes[i].start) >> 20); - node_set_online(i); - } - memnode_shift = compute_hash_shift(nodes, numa_fake); - if (memnode_shift < 0) { - memnode_shift = 0; - printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n"); - return -1; - } - for_each_online_node(i) { + if (!*cmdline) + break; + num = 0; + } +done: + if (!num_nodes) + return -1; + /* Fill remainder of system RAM with a final node, if appropriate. */ + if (addr < max_addr) { + setup_node_range(num_nodes, nodes, &addr, max_addr - addr, + max_addr); + num_nodes++; + } +out: + memnode_shift = compute_hash_shift(nodes, num_nodes); + if (memnode_shift < 0) { + memnode_shift = 0; + printk(KERN_ERR "No NUMA hash function found. NUMA emulation " + "disabled.\n"); + return -1; + } + + /* + * We need to vacate all active ranges that may have been registered by + * SRAT. + */ + remove_all_active_ranges(); + for_each_online_node(i) { e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT, nodes[i].end >> PAGE_SHIFT); setup_node_bootmem(i, nodes[i].start, nodes[i].end); @@ -399,14 +446,15 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn) numa_init_array(); return 0; } -#endif +#undef E820_ADDR_HOLE_SIZE +#endif /* CONFIG_NUMA_EMU */ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn) { int i; #ifdef CONFIG_NUMA_EMU - if (numa_fake && !numa_emulation(start_pfn, end_pfn)) + if (cmdline && !numa_emulation(start_pfn, end_pfn)) return; #endif @@ -486,11 +534,8 @@ static __init int numa_setup(char *opt) if (!strncmp(opt,"off",3)) numa_off = 1; #ifdef CONFIG_NUMA_EMU - if(!strncmp(opt, "fake=", 5)) { - numa_fake = simple_strtoul(opt+5,NULL,0); ; - if (numa_fake >= MAX_NUMNODES) - numa_fake = MAX_NUMNODES; - } + if (!strncmp(opt, "fake=", 5)) + cmdline = opt + 5; #endif #ifdef CONFIG_ACPI_NUMA if (!strncmp(opt,"noacpi",6)) diff --git a/include/asm-x86_64/mmzone.h b/include/asm-x86_64/mmzone.h index fb558fb1d21..19a89377b12 100644 --- a/include/asm-x86_64/mmzone.h +++ b/include/asm-x86_64/mmzone.h @@ -49,7 +49,7 @@ extern int pfn_valid(unsigned long pfn); #ifdef CONFIG_NUMA_EMU #define FAKE_NODE_MIN_SIZE (64*1024*1024) -#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1ul)) +#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1uL)) #endif #endif |